Lotus 2004 ELISE Service Notes page 123

Lotus Service Notes
EH.6 - ELISE S SUPPLEMENT
The Elise S, introduced in May 2006 uses the Toyota '1ZZ-FE' engine instead of the '2ZZ-GE' fitted in the
Elise 111R. The two engines are similar in basic architecture, with the 2ZZ having been derived from the 1ZZ,
and whilst the overhaul procedures are largely common, many of the principal components are different. This
section identifies the main differences between the two engine types.
Valve Mechanism
The 1ZZ uses the same VVT-i 'intelligent' variable intake valve timing system as used on 2ZZ, but without
the intake and exhaust variable valve lift feature. Valve clearance adjustment via selective cam followers rather
than 'top hat' shims. Airbox flap valve programmed to open at 5,000 rpm. Lower rpm limits (see below).
Dimensions
The bore and stroke differ between the two engines, although the capacity difference favours the 2ZZ by
only 2cc. The 1ZZ is more undersquare with dimensions of 79.0 x 91.5mm producing 1794cc (2ZZ: 82.0 x 85.0
= 1796cc). The angle between intake and exhaust valves on the 1ZZ is 10° less at 33°, to permit a compact
cylinder head without the requirement to accommodate variable valve lift. The compression ratio is dropped
from 11.5 to 10.0:1.
Cylinder Block
The open deck alloy cylinder block of the 1ZZ uses dry, thin wall, non-replaceable, cast iron cylinder liners
(2ZZ uses integrated MMC cylinder walls).
Manifolds
The inlet manifold is moulded in plastic to reduce weight and heat transference, and incorporates a resona-
tor feature to optimise gas pulsations for mid-range performance. A unique adaptor is used to link the manifold
to the electronic throttle body which differs from the 2ZZ and other 1ZZ types.
The simplified exhaust manifold and downpipe dispense with the divider plate used on the 2ZZ.
Cooling System
The cooling system is largely unchanged, with all 1ZZ cars using the oil/water heat exchanger and no
front mounted oil coolers. The throttle body is heated as previously, although the feed and return connections
differ in detail and no in-line throttle body thermostat is used.
Technical Data
Capacity
Bore
Stroke
Valve control
Compression ratio
Compression pressure (250 rpm, normal run temp.)
Spark plugs - type
- gap
Peak power (1999/99/EC)
Peak torque (1999/99/EC)
Maximum continuous engine speed
Maximum transient engine speed
Exhaust emissions (Euro 4 & LEV 1)
1ZZ-FE
1794 cc
79.0 mm
91.5 mm
VVT-i
10.0:1
- new 1500 kPa (218 psi)
- min. 1000 kPa (145 psi)
NGK BKR5EYA-11
Denso K16R-U11
1.0 ± 0.05mm
100 kW (136 PS)
@ 6,200 rpm
172 Nm
@ 4,200 rpm
6,800 rpm
7,150 rpm
- CO 0.23 g/km
- HC 0.050 g/km
- NOx 0.0217 g/km
- HC + NOx 0.0717 g/km
- CO (combined) 196 g/km
2
Section EH
2ZZ-GE (reference)
1796 cc
82.0 mm
85.0 mm
VVTL-i
11.5:1
1400 kPa (203 psi)
1000 kPa (145 psi)
NGK IFR6A-11
1.1 mm
141 kW (192 PS)
@ 7,800 rpm
181 Nm
@ 6,800 rpm
8,000 rpm
8,500 rpm
0.42 g/km
0.078 g/km
0.0121 g/km
0.07921 g/km
208 g/km
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